Wikipedia
Hourman (spelled Hour-Man in his earliest appearances, also referred to as the Hour-Man, and the Hourman) is the name of three different fictional superheroes appearing in comics published by DC Comics, the first of whom was created by Ken Fitch and Bernard Baily in Adventure Comics #48 (April 1940), during the Golden Age of Comic Books.
Hourman (Rick Tyler) is a fictional character, a superhero who was created by Roy Thomas, Dann Thomas and first appeared in Infinity Inc. #20 as Rick Tyler, son of the original Hourman, who quickly joined Infinity Inc. as the second Hourman in #21 of that book.
Hourman (Matthew Tyler) is a fictional character and superhero who was created by Grant Morrison and Howard Porter. Based upon the Golden Age character Rex Tyler, he first appeared in JLA #12 (November 1997).